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A Swim Bladder Is a Gas-Filled Sac That Helps Fish

Question 17

Multiple Choice

A swim bladder is a gas-filled sac that helps fish maintain buoyancy. The evolution of the swim bladder from the air-breathing organ (a simple lung) of an ancestral fish is an example of ________.


A) exaptation
B) changes in Hox gene expression
C) paedomorphosis
D) adaptive radiation

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